鋳物の成分偏析の研究（第7報）

―分光分析的研究―

抄録

  The basic experiments on segregation have been conducted in order to substantiate the theoretical mechanism of the shape of segregation curves.
  Succeeding to the previous report, almost similar experiment was conducted this time ; i. e., by controlling the solidification process of the samples completely and four kinds of samples solidified at the different travelling rates of solidification were prepared, and segregation in these samples were determined.
  Aluminium of 99.07% purity and aluminium-copper alloy of 5.8%Cu were used for the preparation of the samples and thus the segregation of copper in the cases of different compositions was determined.
  The gists of the results are as follows:
  (1) The ranges of inverse segregation both in the firstly solidified and finally solidified regions became narrow as the purity of aluminium became high, consequently the slopes of these segregation curves became steep.
  This is due to the decreasing of the range of mushy zone in accompanying with the purity of sample.
  (2) The shape of normal segregation shows the change as if the diffusion coefficient becomes greater when the copper content of sample becomes higher.
  However, this change seems to be resulted not by the change of diffusion coefficient but by the change of the range of mushy zone.